I put my hands together in prayer before the portrait of my late wife.
He cherishes the memories of his deceased wife.
亡夫 refers to one's own deceased husband, while 亡妻 refers to one's own deceased wife, forming the corresponding pair for the opposite gender.
Compound of 亡 (ぼう, 'deceased') and 妻 (さい, 'wife'). The reading さい for 妻 is the on'yomi, commonly used in formal compounds.